Charlton said: “It could happen. He’s a great player and potentially a phenomenally great player.
“He has the sort of ability, talent, pace and invention that people love. It’s why people used to love Stanley Matthews and George Best – because of their footwork and the things they were capable of. Ronaldo’s the same. He could be sensational for the next 10 years.
“He’s got the build, the ability and the desire. And he’s learning quickly.”